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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 1 · Q9
Let A = [1, -2, -1; 0, 4, -1; -3, 2, 1], B = [-2; -5; -7], C = [9, 8, 7], which of the following is defined?
Let $\displaystyle \mathrm{A}=\left[\begin{array}{ccc}1 & -2 & -1 \\ 0 & 4 & -1 \\ -3 & 2 & 1\end{array}\right], \mathrm{B}=\left[\begin{array}{l}-2 \\ -5 \\ -7\end{array}\right], \mathrm{C}=\left[\begin{array}{lll}9 & 8 & 7\end{array}\right]$, which of the following is defined?
Official answer
(A)
Only AB
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CBSE Class 12 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.